docs: def schema(self):
          """ The DQL syntax for creating this item """
          schema = "%s %s %s %s('%s'" % (
              self.name,
              self.data_type,
              self.index_type,
              self.key_type,
              self.index_name,
          )
          if self.includes is not None:
              schema += ", ["
              schema += ", ".join(("'%s'" % i for i in self.includes))
              schema += "]"
          return schema + ")"